CN109555075A - A kind of natural river salmon-type spawning ground substrate habitat rehabilitation and method for reconstructing - Google Patents
A kind of natural river salmon-type spawning ground substrate habitat rehabilitation and method for reconstructing Download PDFInfo
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- CN109555075A CN109555075A CN201910078020.3A CN201910078020A CN109555075A CN 109555075 A CN109555075 A CN 109555075A CN 201910078020 A CN201910078020 A CN 201910078020A CN 109555075 A CN109555075 A CN 109555075A
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- 230000017448 oviposition Effects 0.000 claims abstract description 22
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- 241000902900 cellular organisms Species 0.000 claims description 2
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/02—Stream regulation, e.g. breaking up subaqueous rock, cleaning the beds of waterways, directing the water flow
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K61/00—Culture of aquatic animals
- A01K61/10—Culture of aquatic animals of fish
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/40—Protecting water resources
- Y02A20/402—River restoration
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
- Y02A40/81—Aquaculture, e.g. of fish
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- Civil Engineering (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Marine Sciences & Fisheries (AREA)
- Zoology (AREA)
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Abstract
A kind of natural river salmon-type spawning ground substrate habitat rehabilitation and method for reconstructing, it is related to spawning ground substrate restoration of the ecosystem and method for reconstructing.The invention aims to solve the problem of that current nature evolution and the effect of human activity cause the spawning ground substrate habitat of salmon-type distributed areas to be not suitable for chum salmon spawning and hatching.The present invention is in salmon-type oviposition river, investigate river basin ecological environment, bed configuration bottom looks, selection is suitable for carrying out the observation of substrate habitat with rich groundwater section region in water quality, substrate is analyzed to constitute, select the original cobblestone of history or the basic section of gravel (abbreviation chad), recovery scenario is formulated for substrate situation, using the second ploughing of substrate chad or re-paves improvement spawning ground substrate habitat.The present invention is applied to restoration of the ecosystem field.
Description
Technical field
The invention belongs to restoration of the ecosystem fields, and in particular to a kind of salmon-type spawning ground substrate habitat rehabilitation and rebuild
Method.
Background technique
Salmon-type produces demersal egg, and ovum grain is big, and fish brood amount is lower, 3000-5000 general.Natural oviposition river is located at
Water quality is good, and rich groundwater has in the mountain area tributary or mountain stream streams of certain slope, and spawning ground substrate is generally cobblestone or gravel
Stone (abbreviation chad) substrate.Parent population breeding, which has, chooses spouse exclusiveness and makees nest spawning habit, i.e., a pair of of male and female parent population selection is suitable for
A fish nest (fish nest, nest) is made in habitat in certain thickness chad layer substrate, the length of nest and female fish length (fork is grown) quite,
Depth about 10cm is in half of olive spheroid form, and for raun by the disposable output of ovum in fish nest, milter completes fertilization, uses chad
Fertilized eggs are covered, ovum is embedded in the fish nest of oviposition, and guards breeding fish nest a couple of days until male and female parent is dead.Spawning ground is fish
The place of class natural propagation is the key that habitat and salmon-type incubating oosperm field, larva and juvenile in the fish history of life
Nursing ground and protection place.
In recent years, with the fast development of economic society, rivers (basin) upstream and its tributary drainage area engineering construction, farmland
It opens up wasteland, quarrying is dug the activities such as sand and increased, and the barrier of Habitat for Fish migration channel, vegetation coverage decline, littoral zone protection are caused
The ecological problems such as woods is impaired, soil erosion, river channel sedimentation, River Sediment is capped, streambed substrate habitat changes, cause big
Fiber crops breathe out fish spawning ground area and constantly reduce, and habitat function is constantly degenerated.Arrival spawning ground cannot be traced back by fish occur, or be reached
The spawning habitat that spawning ground is not suitable for cannot lay eggs, or it is not enough it is suitable meet using habitat all trace back fish
It lays eggs and breeds, the Reproductive Strategy for making fish change actively (freedom) selection is had to take the second best, in secondary suitable or basic suitable habitats
Oviposition, fish reproduction and filial generation survive effect and are affected.From nature evolution and the effect of human activity, in addition to water quality, the hydrology
Etc. outside environmental factors, leading to the main reason for spawning ground function of salmon-type is lost, fish cannot make nest oviposition is substrate
The problems such as environment complication, Habitat Fragmentation and river ecosystem health situation.If river chad is excavated, chad substrate is by mud
Husky, water plant covering, some riverbed chads are by vehicle, livestock walking compacting, and fish are difficult to activity or even flood, and also difficulty is stirred；Substrate
Chad layer structure solid jet is unsmooth, the decline of partial habitat dissolved oxygen or water temperature drop etc..The situation that is not suitable in substrate habitat is
Habitat for Fish restoration of the ecosystem needs the critical issue solved.
Summary of the invention
Present invention seek to address that nature evolution and the effect of human activity at present, causes the spawning ground substrate of salmon-type raw
The problem of being not suitable for chum salmon oviposition of border.
A kind of natural river salmon-type spawning ground substrate habitat rehabilitation of the invention and method for reconstructing, it wraps following step
It is rapid:
One, River Sediment is observed: selection water quality is suitable for and rich groundwater section region carries out substrate observation, analyzes substrate
Composition, substrate factor of the habitat are constituted；
Two, it is defeated that dredging River Sediment second ploughing or pre-treatment of mating formation: is carried out to siltation covering silt region on cobblestone substrate
It is husky；Silt in crack of stone or compacting cobblestone section progress substrate are turned over to scrape and be washed away；To the water grown on silt in silt or crack of stone
Grass is purged；The rough and uneven in surface section of substrate is caused to carry out smooth recovery to due to adopting sand digging stone；To in river accumulate sundries into
Row cleaning；
Three, River Sediment second ploughing: silt in substrate crack of stone or compacting chad section stir using excavating machinery multiple
It ploughs, second ploughing thickness is in 10cm or more；
Four, River Sediment is mated formation reconstruction: chad is carried out to the section for making nest substrate that cannot still lay eggs after second ploughing and is mated formation, chad
Raw material mats formation the cobblestone of partial size 1-8cm or gravel the bottom of river channel after handling before step 2 by screening, and 3-7cm
The chad of partial size accounts for 80% or more；Depending on second ploughing thickness, maximum gauge of mating formation is 20cm, and the loose mobile layer of substrate chad exists
30cm or more；
Five, littoral zone forest reserve is built, prevention soil and water loss reduces substrate sediment siltation and water pollution, prevents secondary
Water plant breeds,
Six, beneficial organism group is restored for substrate after mating formation, carries out the reconstruction of River Sediment habitat.
The present invention has following advantage:
The present invention investigates river basin ecological environment, bed configuration bottom looks in salmon-type oviposition river, and selection is suitable in water quality
The observation of substrate habitat is preferably carried out with rich groundwater section region, analysis substrate is constituted, and selects the original cobblestone of history or gravel
(abbreviation chad) basis section, formulates recovery scenario for substrate situation, using the second ploughing of substrate chad or re-paves improvement production
Ovum field substrate habitat.
Substrate habitat rehabilitation includes substrate second ploughing or engineering pre-treatment of mating formation, and it is spawning ground river bottom that substrate, which is mated formation with second ploughing,
The key link of matter habitat restoration of the ecosystem.Demand primarily directed to fish oviposition breeding to chad substrate habitat is repaired step by step
It is multiple.The present invention establishes salmon-type spawning ground substrate ecological restoring method:
Dredging and remote bank output are carried out to siltation covering silt region on chad substrate, silt in crack of stone or chad are adhered to
Object progress substrate, which turns over to scrape, to be washed away, and is suitably removed to the water plant, the water cotton that grow on silt in silt or crack of stone, to due to adopting sand
Digging stone causes the rough and uneven in surface section of substrate to carry out smooth recovery, clears up sundries is accumulated in river.Substrate second ploughing is suitable for
Substrate chad layer partial size and thickness meet the requirements but fish are not easy to stir and make nest oviposition section, to silt in crack of stone or compacting goose ovum
Stone section carries out substrate and stirs second ploughing, and second ploughing can reduce substrate compactness, is conducive to fish oviposition breeding.It is in Qian Chu that substrate, which is mated formation,
On the basis of reason and second ploughing, selecting is suitable for chad material, carries out substrate according to substrate bottom looks condition and mats formation, and it is extensive to carry out substrate habitat
Multiple or reconstruction.
The present invention carries out except silt weeding river chad substrate, carries out dredging regulation to river, reduces the attachment of chad surface
Object increases the finish on chad substrate surface, constitutes habitat and is more advantageous to the hatching development that fish make nest and fertilized eggs；
The compactness that second ploughing changes river shingle or chad substrate is stirred to river chad substrate, increasing fish may be selected
Habitat, and be easy to stir and make nest；
River riverbed cobblestone or chad layer is thinning or shape unevenly distributed when substrate mats formation change due to excavation gravel
Condition can reach the requirement that salmon-type makees nest oviposition；
To the substrate newly mated formation since original substrate is partly or entirely covered, certain time is needed to make microorganism, swim
The biocoenes such as biology, benthon spontaneous recovery or manual restoration such as collect the shellfish in raw water domain and snail are mated formation in substrate
It replaces again afterwards or suitably increases biomass and density, it is made to carry the covering of the biological physical efficiency in original waters into habitat.
By means of the present invention to spawning ground River Sediment mat formation and rebuild and relevant ecological repair after, from downstream will return
Chum salmon Repoductive population is returned to transport to spawning ground (such as Huma River, Tang Wanghe), male and female parent population is put into spawning ground river in 1:1 ratio
In stream, parent population is voluntarily chosen spouse combo, and the spawning ground river after substrate habitat rehabilitation is laid eggs breeding, breeding potential reach 95% with
On, pass through expert's onsite acceptance.
Detailed description of the invention
Fig. 1 is natural river salmon-type spawning ground schematic diagram of the invention；Wherein, 1 is substrate chad, and 2 be river
Substrate sandstone, 3 be river vegetation, and 4 be river ramp, and 5 be river.
Specific embodiment
Specific embodiment 1: a kind of natural river salmon-type spawning ground substrate habitat rehabilitation of present embodiment with
Method for reconstructing, its packet following steps:
One, River Sediment is observed: selection water quality is suitable for and rich groundwater section region carries out substrate observation, analyzes substrate
Composition, substrate factor of the habitat are constituted；
Two, it is defeated that dredging River Sediment second ploughing or pre-treatment of mating formation: is carried out to siltation covering silt region on cobblestone substrate
It is husky；Silt in crack of stone or compacting cobblestone section progress substrate are turned over to scrape and be washed away；To the water grown on silt in silt or crack of stone
Grass is purged；The rough and uneven in surface section of substrate is caused to carry out smooth recovery to due to adopting sand digging stone；To in river accumulate sundries into
Row cleaning；
Three, River Sediment second ploughing: substrate second ploughing is suitable for substrate chad layer partial size and thickness meets the requirements but fish are not easy
It stirs and makees nest oviposition section；According to chad compaction, using excavating machinery tool to silt in substrate crack of stone or compacting chad
Section carries out stirring second ploughing, and second ploughing thickness is preferred with reaching the loose mobile layer of substrate chad, and minimum in 10cm or more, second ploughing can subtract
Light substrate compactness makees nest oviposition breeding conducive to fish.
Four, River Sediment is mated formation reconstruction: carrying out chad paving to the section for oviposition is still not achieved after second ploughing making nest substrate requirement
Dress, by the cobblestone of partial size 1-8cm or gravel mat formation before step 2 handle after bottom of river channel, depending on second ploughing thickness,
Maximum gauge of mating formation is 20cm, and the loose mobile layer of substrate chad is in 30cm or more；
Five, littoral zone forest reserve is built, prevention soil and water loss reduces substrate sediment siltation and water pollution, prevents secondary
Water plant breeds,
Six, beneficial organism group is restored for substrate after mating formation, carries out the reconstruction of River Sediment habitat.
The analysis substrate ingredient of present embodiment is to acquire bottom sample by observation, and substrate is divided into chad type, silt
Type, mud type and cob type etc., while to fluvial morphology, water temperature, flow velocity, water level and groundwater resources (winter water level and water temperature
Situation) situations and the water quality indicator such as supplement for example dissolved oxygen, pH, conductivity, COD, three nitrogen (nitrate nitrogen, cultured water, ammonia nitrogen),
Physics and chemistry, the hydrology factors such as total nitrogen (TN), total phosphorus (TP), basicity, hardness carry out investigation detection and research and application, according to chum salmon
Class requires spawning ground river habitat, assigns all kinds of indexs to weighted value.Egg-laying season river factor of the habitat weight size is followed successively by
Substrate, dissolved oxygen, water temperature, water level, pollutant (such as N, P), substrate are crucial factor of the habitat and relatively fixed not reason
, even more there is the more problems factor in son, but can be changed reparations using engineering means, and can local and
Regional area realizes that management control sentences the suitability of substrate that is, when other factors of the habitat substantially meet fish reproduction and need
Disconnected is key problem in technology.
Specific embodiment 2: the present embodiment is different from the first embodiment in that: water quality is suitably in step 1
Referring to that river basins vegetation coverage reaches 70%, soil erosion control effect is good, it is effectively controlled, river autumn, winter, spring
Ji Jun does not stop, and for flow velocity in 0.2~1.0m/s, river mean depth reaches 30cm, and streambed substrate basis is cobblestone or gravel
Composition, dissolved oxygen reach 6mg/L.It is other same as the specific embodiment one.
Specific embodiment 3: the present embodiment is different from the first embodiment in that: the bottom after being analyzed in step 1
Matter requires to reach the operation that following standard carries out step 2 again:
Chad partial size is in 1~10cm；Chad any surface finish；Chad thickness degree reaches 30cm or more；Dissolved oxygen 6mg/L with
On；Water flow is sprung up；River chad substrate is uniformly distributed；Chad substrate has spring water；Spawning ground section noiseless, vibration；Chad
On without car and boat people and animals trample passage.
It is other same as the specific embodiment one.
Specific embodiment 4: the present embodiment is different from the first embodiment in that: by the cobblestone of partial size 3-7cm
Or chad mat formation before step 2 handle after bottom of river channel.It is other same as the specific embodiment one.
Specific embodiment 5: the present embodiment is different from the first embodiment in that: water flow springs up finger: fish are in water
It is stirred in stream.It is other same as the specific embodiment one.
Specific embodiment 6: the present embodiment is different from the first embodiment in that: river chad substrate uniformly divides
Cloth, and non sludge, water plant and the covering of water cotton on chad substrate.It is other same as the specific embodiment one.
Specific embodiment 7: the present embodiment is different from the first embodiment in that: if River Sediment to be reconstructed
Biota, which falls, to be destroyed, then restores biocoene.It is other same as the specific embodiment one.
Specific embodiment 8: the present embodiment is different from the first embodiment in that: substrate second ploughing is suitable for substrate
Chad layer partial size and thickness meet salmon-type requirement, but fish are not easy to stir the section for making nest oviposition.Other and specific reality
It is identical to apply mode one.
Specific embodiment 9: the present embodiment is different from the first embodiment in that: second ploughing thickness is to reach substrate
Subject to the loose mobile layer of chad.It is other same as the specific embodiment one.
Specific embodiment 10: the present embodiment is different from the first embodiment in that: by the cobblestone of partial size 3-7cm
Or gravel mat formation before step 2 handle after bottom of river channel.It is other same as the specific embodiment one.
The content of present invention is not limited only to the content of the respective embodiments described above, the group of one of them or several specific embodiments
The purpose of invention also may be implemented in contract sample.
By following example verifying the invention has the advantages that:
Embodiment 1
A kind of natural river salmon-type of the present embodiment spawning ground substrate habitat rehabilitation and method for reconstructing, it wraps following step
It is rapid:
One, River Sediment is observed: selection water quality is suitable for and rich groundwater section region carries out substrate observation, analyzes substrate
Composition, substrate factor of the habitat are constituted；
Two, it is defeated that dredging River Sediment second ploughing or pre-treatment of mating formation: is carried out to siltation covering silt region on cobblestone substrate
It is husky；Silt in crack of stone or compacting cobblestone section progress substrate are turned over to scrape and be washed away；To the water grown on silt in silt or crack of stone
Grass is purged；The rough and uneven in surface section of substrate is caused to carry out smooth recovery to due to adopting sand digging stone；To in river accumulate sundries into
Row cleaning；
Three, River Sediment second ploughing: substrate second ploughing is suitable for substrate chad layer partial size and thickness meets the requirements but fish are not easy
It stirs and makees nest oviposition section；According to chad compaction, using excavating machinery tool to silt in substrate crack of stone or compacting chad
Section carries out stirring second ploughing, and second ploughing thickness is preferred with reaching the loose mobile layer of substrate chad, and minimum in 10cm or more, second ploughing can subtract
Light substrate compactness makees nest oviposition breeding conducive to fish.
Four, River Sediment is mated formation reconstruction: carrying out chad paving to the section for oviposition is still not achieved after second ploughing making nest substrate requirement
Dress, by the cobblestone of partial size 1-8cm or gravel mat formation before step 2 handle after bottom of river channel, depending on second ploughing thickness,
Maximum gauge of mating formation is 20cm, and the loose mobile layer of substrate chad is in 30cm or more；
Five, littoral zone forest reserve is built, prevention soil and water loss reduces substrate sediment siltation and water pollution, prevents secondary
Water plant breeds,
Six, beneficial organism group is restored for substrate after mating formation, carries out the reconstruction of River Sediment habitat.
Wherein, analysis substrate ingredient is to acquire bottom sample by observation, and substrate is divided into chad type, mud type, mud
Type and cob type etc., while fluvial morphology, water temperature, flow velocity, water level and groundwater resources (winter water level and water temperature condition) are mended
Situations and water quality indicator such as dissolved oxygen, pH, conductivity, COD, three nitrogen (nitrate nitrogen, cultured water, ammonia nitrogen), total nitrogen such as fill
(TN), the physics and chemistry such as total phosphorus (TP), basicity, hardness, the hydrology factor carry out investigation detection and research and application, according to salmon-type pair
River habitat in spawning ground requires, and assigns all kinds of indexs to weighted value.Egg-laying season river factor of the habitat weight size be followed successively by substrate,
Dissolved oxygen, water temperature, water level, pollutant (such as N, P), substrate are crucial factor of the habitat and the relatively fixed motionless factor, even more
There are problems that the more problems factor, but reparation can be changed using engineering means, and can be in place and partial zones
Management control is realized in domain, i.e., when other factors of the habitat substantially meet fish reproduction and need, the suitability judgement to substrate is skill
Art is crucial.
The substrate that analysis is received will reach following standards: chad partial size is accounted for mostly good in 1-10cm with middle partial size；Chad surface
It is brighter and cleaner, rare attachment；Chad thickness degree reaches 30cm or more, and floatability is preferable, and water flow can be sprung up, and fish can stir, stone
The gap water flowing of gravel bed chad is good, guarantees dissolved oxygen 6mg/L or more.River chad substrate is uniformly distributed, suitability substrate area
Ratio is big, and basic non sludge, water plant and water cotton etc. cover on chad substrate, underground water in chad substrate (or spring who) magnitude of recruitment
Greatly, the environmental disturbances such as spawning ground section noiseless, vibration trample passage without car and boat people and animals etc. on riverbed chad.
Water quality is suitable for referring to that river basins vegetation coverage reaches 70%, and soil erosion control effect is good, river autumn, winter
Season, spring do not stop, and for flow velocity in 0.2~1.0m/s, river mean depth reaches 30cm, streambed substrate basis be cobblestone or
Chad composition, dissolved oxygen reach 6mg/L.
Using the present embodiment method to natural river salmon-type spawning ground substrate habitat rehabilitation and after rebuilding, from downstream
Chum salmon Repoductive population will be returned to transport to spawning ground (such as Huma River, Tang Wanghe), male and female parent population is put into oviposition in 1:1 ratio
In river, parent population is voluntarily chosen spouse combo, and the spawning ground river after substrate habitat rehabilitation is laid eggs breeding, and breeding potential reaches
95% or more.
Claims (10)
1. a kind of natural river salmon-type spawning ground substrate habitat rehabilitation and method for reconstructing, it is characterised in that it wraps following step
It is rapid:
One, River Sediment is observed: selection water quality is suitable for and rich groundwater section region carries out substrate observation, analyzes substrate group
At substrate factor of the habitat is constituted；
Two, dredging sediment transport River Sediment second ploughing or pre-treatment of mating formation: is carried out to siltation covering silt region on cobblestone substrate；It is right
Silt or compacting cobblestone section progress substrate are turned over to scrape and be washed away in crack of stone；The water plant grown on silt in silt or crack of stone is carried out
It removes；The rough and uneven in surface section of substrate is caused to carry out smooth recovery to due to adopting sand digging stone；It clears up sundries is accumulated in river；
Three, River Sediment second ploughing: carrying out stirring second ploughing using excavating machinery to silt in substrate crack of stone or compacting chad section, multiple
Thickness is ploughed in 10cm or more；
Four, River Sediment is mated formation reconstruction: chad is carried out to the section for making nest substrate that cannot still lay eggs after second ploughing and is mated formation, chad raw material
By screening, the cobblestone of partial size 1-8cm or gravel are mated formation the bottom of river channel after handling before step 2, and 3-7cm partial size
Chad account for 80% or more；Depending on second ploughing thickness, maximum gauge of mating formation is 20cm, and the loose mobile layer of substrate chad is in 30cm
More than；
Five, littoral zone forest reserve is built, prevention soil and water loss reduces substrate sediment siltation and water pollution, prevents secondary aquatic
Plant breeds；
Six, beneficial organism group is restored for substrate after mating formation, carries out the reconstruction of River Sediment habitat.
2. a kind of natural river salmon-type spawning ground according to claim 1 substrate habitat rehabilitation and method for reconstructing,
It is characterized in that water quality is suitable for referring to that river basins vegetation coverage reaches 70% in step 1, soil erosion is effectively controlled, river
Stream autumn, winter, spring do not stop, and for flow velocity in 0.2~1.0m/s, river mean depth reaches 30cm, streambed substrate basis
It is formed for cobblestone or gravel, dissolved oxygen reaches 6mg/L.
3. a kind of natural river salmon-type spawning ground according to claim 1 substrate habitat rehabilitation and method for reconstructing,
It is characterized in that the substrate after analyzing in step 1 requires to reach the operation that following standard carries out step 2 again:
Chad partial size is in 1~10cm；Chad any surface finish；Chad thickness degree reaches 30cm or more；Dissolved oxygen 6mg/L or more；Water
Stream is sprung up；River chad substrate is uniformly distributed；Chad substrate has spring water；Spawning ground section noiseless, vibration；Without vehicle on chad
Ship people and animals trample passage.
4. a kind of natural river salmon-type spawning ground according to claim 3 substrate habitat rehabilitation and method for reconstructing,
It is characterized in that chad partial size is in 3~7cm.
5. a kind of natural river salmon-type spawning ground according to claim 3 substrate habitat rehabilitation and method for reconstructing,
It is characterized in that water flow springs up finger: fish stir in water flow.
6. a kind of natural river salmon-type spawning ground according to claim 3 substrate habitat rehabilitation and method for reconstructing,
It is characterized in that river chad substrate is uniformly distributed, and non sludge, water plant and the covering of water cotton on chad substrate.
7. a kind of natural river salmon-type spawning ground according to claim 1 substrate habitat rehabilitation and method for reconstructing,
It is characterized in that being destroyed if River Sediment biota to be reconstructed falls, biocoene is restored.
8. a kind of natural river salmon-type spawning ground according to claim 1 substrate habitat rehabilitation and method for reconstructing,
It is characterized in that substrate second ploughing is suitable for substrate chad layer partial size and thickness meets salmon-type requirement, but fish are not easy to stir
Make the section of nest oviposition.
9. a kind of natural river salmon-type spawning ground according to claim 1 substrate habitat rehabilitation and method for reconstructing,
It is characterized in that second ploughing thickness, which is subject to, reaches the loose mobile layer of substrate chad.
10. a kind of natural river salmon-type spawning ground according to claim 1 substrate habitat rehabilitation and method for reconstructing,
It is characterized in that by the cobblestone of partial size 3-7cm or gravel mat formation before step 2 handle after bottom of river channel.
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| CN114698576A (en) * | 2022-05-23 | 2022-07-05 | 中国长江三峡集团有限公司 | Natural propagation incubation protection device for special rare fishes at upper reaches of Yangtze river and use method |
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